Lock



Feb. 27, 1940.

L. S. COLLINS LOCK Filed May 29, 1937 Patented Feb. 27, 1940 UNITED S ATES:

, RATE NT oF FIcE Loon LeonardS, Collins, Detroit; Michrf v Application May. 29, 1937-; sail-1. No.',145,45s;.-

1 Claim, r (01. "292%173) movable operating member adapted to cooperate with stop or detent means to positively lock the lever in one or other of its bolt setting positions.

It is also proposed to so form the lever that themain arm thereof will act as a stop against the rear end of the bolt when the bolt is moved to its closed position.

The invention further and more particularly contemplates the provision, in the cover plate, casing, or other overlying part of the look, a substantially Z-shaped slot in which the aforesaid movable member is guided and in which the said movable member may be locked against mischievous or inadvertent displacement from an open or closed position by virtue of its engagement in one or other of the terminal legs of thesaid slot. Still further, the invention provides, where thought necessary'or desirable, for snap means or catches, yieldable or otherwise, designed to prevent accidental engagement or disengagement of the operating member in or from said terminal legs of the slot.

Still further objects and advantages subsidiary to or resulting from the invention as it may be carried into effect, will become apparent as the said invention is hereinafter further disclosed.

In carrying the said invention into efiect, I may provide in a lock, a slidably mounted bolt movable by one arm of a bell-crank lever the other arm of which carries an operating pin or member movable thereon and guided in a Z- shaped slot in the lock casing, the lever being actuated by movement of the said pin along the main part of the said slot and locked in one or other of its bolt-operating positions by engagement of the said pin in one or other of the terminal legs of the said slots, and yieldable catches resisting movement of the said pin into and out of the said legs of the slot, the last mentioned arm of the said lever preferably so co-acting with the inner end of the said bolt that it will act as a positive stop against retraction of the said bolt when said lever is moved to effect the closing of the bolt on. its keeper. The keeper is proposed to be in the form of a member with a slotted head entering and concealed by the lock casingand provided with an annular shoulder extending about the opemng of-the casing through which the keeperlente'rs.

All of which is more particularly described and ascertained-hereinafter'by-way of example havingreference to the accompanying drawing, wherein: I

Figure 1 is a perspective View of the base plateof the lock and the parts carried thereby;

Figure 2 is a similar view-of the-cover plate or casing; a

Figure 3 is an elevation ofthe-said lock; and Figure 4 is'a perspective view of the keeper.

Similar characters of reference indicate simi-' lar parts in the several figures of the drawing.

, l indicates the base plate of the lock, on which the bolt 2 is slidably mounted by virtue of its slotted engagement with guide pins 3 and 4. 5 is a bell-crank lever pivoted on the stud 6 and having its shorter arm 1 extending intoa recess 8 in the said bolt, the long arm 9 of the said bell-crank lever extending materially beyond the rear end of the bolt which is shown as having a cam surface l0 against which an inner edge of the arm 9 of the bell-crank lever will engage when the said lever is 'moved to the position shown in Figure 1, wherein the bolt is projected forwardly or closed.

ll is a bow spring mounted on a pin l2 and engaging the rear end of the said bolt urging the same forwardly.

The arm 9 of the bell-crank lever is shown as being slotted at l3 andprovided with a sliding shoe [4 from which a pin or shaft I5 extends perpendicularly through the said slot [3, the said pin being thereby movable laterally of its axis and along the said slot l3.

When the cover plate I6 is assembled on the base plate I to house the mechanism described, the pin [5 extends outwardly of the said cover plate through a slot I! having offset terminal legs l8 and I9, the said slot being, therefore, of a generally Z-shaped formation; and it will be readily apparent that movement of the pin l5 in one orother direction along the slot I! will efiect the pivotal movement of the bell-crank lever and consequently determine the opening or closing movement of the bolt. It will also be recognized that when such movement is effected to its limits, the said pin l5 by virtue of its slotted mounting in the arm 9 of the bell-crank lever may be moved into the offset leg l8 or the leg [9, as the case may be, of the slot l1, and that when it is so engaged in one or other of the said legs 18 or l9 movement of the bell-crank lever in one or other direction is efiectively preentrance of the said legs, to yieldably resist thev movement of the pin l5 into and outof the legs l8 and IQ of the slot l7.

While the arrangement described is primarily intended as a night-latch mechanism operable solely by means of the said pin l5, which maybe provided with any convenient form of handle or knob (not shown) for that purpose, any suitable provision may be made for key or other operation from the opposite side of the lock, and in the drawing 22 indicates a lock cylinder or its housing, such as .may enclose the usual key operable tumbler mechanism for the purpose of controlling the rotation of a gear 23, or equivalent means, adapted to reciprocate the bolt as 25 through the agency of rack teeth 24 formed on the said bolt. Where the bolt is so operated the bell-crank lever will .be rocked by the movement of the bolt, the pin l5 freely moving in one or the other direction along the length of the, main slot H, and in this case the spring catches 20 and 2| serve to prevent inadvertent slipping of the said pin into one or other of the legs I8 or H) of slot I! such as might result in undesirable locking of the elements against key operation;

cylindrical opening 21 in the base plate and the shoulder 25 overlying the margins of said opening when the lock is closed on the keeper.

This invention may be developed within the scope of the following claim without departing from the essential features of the said inventionand it is desired that the specification and drawing be read as being merely illustrative and not in the limiting sense, except as necessitated by the prior art.

What I claim is:

In a look, a bolt, a swinging bolt-actuating lever, said lever in its bolt-projected position moving into the path of said bolt to actas a stop 7 thereagainst, a lever-operating member attached to said lever, a cover plate having a guide slot,

therein for said member, and detent means at each end of the guide slot with which said mem her may be manually engaged to prevent its movement in said slot.

LEONARD. S. COLLINS. 

